CVE-2021-30761

2021-09-0800:00:00

attackerkb.com

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

0.004 Low

EPSS

Percentile

71.3%

JSON

A memory corruption issue was addressed with improved state management. This issue is fixed in iOS 12.5.4. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited…

Recent assessments:

gwillcox-r7 at June 21, 2021 7:29pm UTC reported:

From what I can tell this is a memory corruption vulnerability in WebKit. WebKit vulns are commonly exploited in the wild and this one is no exception with <https://support.apple.com/en-us/HT212548> noting that active exploitation in the wild has been discovered. It is a little odd that the patched version is noted as version 12.5.4 of iOS given the latest version is 14.6, but if you are still running on the 12.x branch, make sure to update to 12.5.4 to receive the patches for this vulnerability, particularly given it has a working exploit in the wild. This was likely used alongside the WebKit UAF vulnerability (see <https://attackerkb.com/topics/Gyq95f2J1L/cve-2021-30762>) that was patched in the same release to form a full working exploit against iOS devices.

Assessed Attacker Value: 0
Assessed Attacker Value: 0Assessed Attacker Value: 0